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How to use Ettercap / sniff network over WiFi?


martyr
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Hello everyone,

I am trying to sniff a network.

Adapter TL-WN722N

Target AP signal: %80-85

Target network topology: 1 router, 15 clients (mostly windows)

My steps are:

echo 1 > /proc/sys/net/ipv4/ip_forward

airmon-ng start wlan0

going to /etc/ettercap/etter.conf to set:

ec_uid = 0
ec_gid = 0 

--

Commenting out iptables

# if you use iptables:
redir_command_on = "iptables -t n....
redir_command_off = "iptables -t ......

and then

ettercap -G

Sniff -> Unified Sniffing, selecting adapter wlan0

Hosts -> Scan Hosts -> Add victims to target list and then MITM->Arp and then Start->Start Sniffing

And then running

dsniff -i wlan0

to sniff interesting packets...

Okay everything works great until here.

Sometimes, ettercap kills the connection of client.

As far i understand, i am forwarding packets with ARP Poisoning.

So here are my questions:

- Is that possible to sniff network in "passive" or "unoffensive" mode?

Ettercap has "Unoffensive" option but if i go with that, i can't scan hosts.

I can't understand by.

- My purpose is that just sniffing network, not ALTER or EDIT any packets. Just sniffing.

- How can i start a proper sniffing?

My target AP has %80-85 signal quality.

No packet loss to gateway.

Any suggestions would be great.

Thanks.

Edited by martyr
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There are limits to what sslstrip can do, specifically in relation to HSTS.

If you just want to sniff, start low-level and run wireshark to see traffic is flowing through you.

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Its under the adapter settings in wireshark.

Capture > interfaces > options for the NIC in use, or for both if you want to use monitor and managed mode at the same time.

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